The following map is probably possible. S200_158 (0,4): RagcardenI don't quite manage to get a stable situation, but I can survive for 6 or so minutes. Here is a screenshot, which might give someone some ideas.

S200_64 (5,2): Bradsometum (I)(-)Nov 10 2017: I've gotten to two reactors and one mortar and a reasonably large 10 height "fence", but one mortar isn't sufficient to keep up. I'm building in the lower left, quickly clearing a placement for the command center as the original placement gets overrun too fast. This is very hard.

S200_187 (7,3): Abertoft (?)Nov 10 2017: Haven't tried, need to clear my way over to the right side of the map first

S200_119 (9,2): Madotis (I)(-)Nov 10 2017: Haven't tried, need to clear my way over to the right side of the map first

S200_74 (4,6): FurhamNov 10 2017: I have tried this a little bit, but only in the original position. I think doing the lower level in the right corner is probably better.

S200_162 (2,8): MolzacdaiNov 10 2017: I have tried three different positions. The original position, down to the right, and even clearing a new placement in the lower left corner. I don't get anything working. I think it's easier than Bradsometum though.

S200_2 (2,0): FantoletNov 10 2017: I have tried this a lot. Gotten to 4+ reactors and two mortars in a sizeable placement in the bottom (attaching screenshot). That said, I keep getting overrun. This is probably the easiest of the ones I've tried.Nov 11 2017: I'm surviving several waves of air attacks. Seems like you need larger than 6x4 starting position though as you can't fit enough mortars given you need 5 beams to defend against air. (see attachment).Nov 11 2017: I'm surviving multiples waves of air attacks. You can go down to only 4 beams. However, by minute 18 you probably need to be at 6 mortars, and I don't see how you can get enough energy to sustain that. This is really really tricky. I'm attaching screenshot of my furthest progress.

I haven't played the map, so I presume it was reported as "perhaps impossible". I changed its category.

EDIT: Actually, it was listed in the impossible map thread. However, three of those maps have now been completed, so I put all the maps in the "not yet completed" category, unless I could verify myself that they were really impossible.

I also added Sudpir (reported in another thread) as not yet completed.

Here are some earlier screenshots for Fantolet. I have more, if anyone is interested.

I think the main differences with beetree are:- I went for a 7x5 area, for more energy production- I built a reactor before my terp. I think beetree didn't do that, causing him to have a much less energy later on.

Just did Ragruckstead as per Adam88's inquiry. Not tough enough that I think it needs to go on this list. Went 2 reactors before terp, could hold out with 2 mortars while getting more established, then a single blaster. Just took some time to get rolling and expand northward. I'm sure its possible to do much more aggressively than I did.